#include <bits/stdc++.h>

using namespace std;

int main() {
    long long start = clock();//Mac/Linux  纳秒 vs windows平台下是毫秒
    //被测试程序
    long long end = clock();
    cout << 1.0 * (end - start) / CLOCKS_PER_SEC << endl;
    return 0;
}